/*!
* This file is part of Aloha Editor Project http://aloha-editor.org
* Copyright © 2010-2011 Gentics Software GmbH, aloha@gentics.com
* Contributors http://aloha-editor.org/contribution.php 
* Licensed unter the terms of http://www.aloha-editor.org/license.html
*//*
* Aloha Editor is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.*
*
* Aloha Editor is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/

// Ensure GENTICS Namespace
GENTICS = window.GENTICS || {};
GENTICS.Utils = GENTICS.Utils || {};

define(
['aloha/jquery', 'util/class', 'aloha/ecma5shims'],
function(jQuery, Class, $_) {
	
	
	var
		GENTICS = window.GENTICS,
//		Class = window.Class,
		// http://www.w3.org/TR/DOM-Level-3-Core/core.html#ID-1841493061
		Node = {
    		'ELEMENT_NODE' : 1,
    		'ATTRIBUTE_NODE': 2,
    		'TEXT_NODE': 3,
    		'CDATA_SECTION_NODE': 4,
    		'ENTITY_REFERENCE_NODE': 5,
    		'ENTITY_NODE': 6,
    		'PROCESSING_INSTRUCTION_NODE': 7,
    		'COMMENT_NODE': 8,
    		'DOCUMENT_NODE': 9,
    		'DOCUMENT_TYPE_NODE': 10,
    		'DOCUMENT_FRAGMENT_NODE': 11,
    		'NOTATION_NODE': 12,
    		//The two nodes are disconnected. Order between disconnected nodes is always implementation-specific.
    		'DOCUMENT_POSITION_DISCONNECTED': 0x01,
    		//The second node precedes the reference node.
    		'DOCUMENT_POSITION_PRECEDING': 0x02, 
    		//The node follows the reference node.
    		'DOCUMENT_POSITION_FOLLOWING': 0x04,
    		//The node contains the reference node. A node which contains is always preceding, too.
    		'DOCUMENT_POSITION_CONTAINS': 0x08,
    		//The node is contained by the reference node. A node which is contained is always following, too.
    		'DOCUMENT_POSITION_CONTAINED_BY': 0x10,
    		//The determination of preceding versus following is implementation-specific.
    		'DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC': 0x20
    	};

	

/**
 * @namespace GENTICS.Utils
 * @class Dom provides methods to get information about the DOM and to manipulate it
 * @singleton
 */
var Dom = Class.extend({
	/**
	 * Regex to find word characters.
	 */
	wordRegex: /[\u0041-\u005A\u0061-\u007A\u00AA\u00B5\u00BA\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377\u037A-\u037D\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u0525\u0531-\u0556\u0559\u0561-\u0587\u05D0-\u05EA\u05F0-\u05F2\u0621-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0904-\u0939\u093D\u0950\u0958-\u0961\u0971\u0972\u0979-\u097F\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BD\u09CE\u09DC\u09DD\u09DF-\u09E1\u09F0\u09F1\u0A05-\u0A0A\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39\u0A59-\u0A5C\u0A5E\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0\u0AE1\u0B05-\u0B0C\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3D\u0B5C\u0B5D\u0B5F-\u0B61\u0B71\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BD0\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C33\u0C35-\u0C39\u0C3D\u0C58\u0C59\u0C60\u0C61\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBD\u0CDE\u0CE0\u0CE1\u0D05-\u0D0C\u0D0E-\u0D10\u0D12-\u0D28\u0D2A-\u0D39\u0D3D\u0D60\u0D61\u0D7A-\u0D7F\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0E01-\u0E30\u0E32\u0E33\u0E40-\u0E46\u0E81\u0E82\u0E84\u0E87\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA\u0EAB\u0EAD-\u0EB0\u0EB2\u0EB3\u0EBD\u0EC0-\u0EC4\u0EC6\u0EDC\u0EDD\u0F00\u0F40-\u0F47\u0F49-\u0F6C\u0F88-\u0F8B\u1000-\u102A\u103F\u1050-\u1055\u105A-\u105D\u1061\u1065\u1066\u106E-\u1070\u1075-\u1081\u108E\u10A0-\u10C5\u10D0-\u10FA\u10FC\u1100-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u1380-\u138F\u13A0-\u13F4\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7\u17DC\u1820-\u1877\u1880-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191C\u1950-\u196D\u1970-\u1974\u1980-\u19AB\u19C1-\u19C7\u1A00-\u1A16\u1A20-\u1A54\u1AA7\u1B05-\u1B33\u1B45-\u1B4B\u1B83-\u1BA0\u1BAE\u1BAF\u1C00-\u1C23\u1C4D-\u1C4F\u1C5A-\u1C7D\u1CE9-\u1CEC\u1CEE-\u1CF1\u1D00-\u1DBF\u1E00-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2071\u207F\u2090-\u2094\u2102\u2107\u210A-\u2113\u2115\u2119-\u211D\u2124\u2126\u2128\u212A-\u212D\u212F-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2183\u2184\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CEE\u2D00-\u2D25\u2D30-\u2D65\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u2E2F\u3005\u3006\u3031-\u3035\u303B\u303C\u3041-\u3096\u309D-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312D\u3131-\u318E\u31A0-\u31B7\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FCB\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA61F\uA62A\uA62B\uA640-\uA65F\uA662-\uA66E\uA67F-\uA697\uA6A0-\uA6E5\uA717-\uA71F\uA722-\uA788\uA78B\uA78C\uA7FB-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uA840-\uA873\uA882-\uA8B3\uA8F2-\uA8F7\uA8FB\uA90A-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF\uAA00-\uAA28\uAA40-\uAA42\uAA44-\uAA4B\uAA60-\uAA76\uAA7A\uAA80-\uAAAF\uAAB1\uAAB5\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uABC0-\uABE2\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA2D\uFA30-\uFA6D\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE70-\uFE74\uFE76-\uFEFC\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC]/,

	/**
	 * Regex to find non-word characters.
	 */
	nonWordRegex: /[^\u0041-\u005A\u0061-\u007A\u00AA\u00B5\u00BA\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377\u037A-\u037D\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u0525\u0531-\u0556\u0559\u0561-\u0587\u05D0-\u05EA\u05F0-\u05F2\u0621-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0904-\u0939\u093D\u0950\u0958-\u0961\u0971\u0972\u0979-\u097F\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BD\u09CE\u09DC\u09DD\u09DF-\u09E1\u09F0\u09F1\u0A05-\u0A0A\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39\u0A59-\u0A5C\u0A5E\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0\u0AE1\u0B05-\u0B0C\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3D\u0B5C\u0B5D\u0B5F-\u0B61\u0B71\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BD0\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C33\u0C35-\u0C39\u0C3D\u0C58\u0C59\u0C60\u0C61\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBD\u0CDE\u0CE0\u0CE1\u0D05-\u0D0C\u0D0E-\u0D10\u0D12-\u0D28\u0D2A-\u0D39\u0D3D\u0D60\u0D61\u0D7A-\u0D7F\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0E01-\u0E30\u0E32\u0E33\u0E40-\u0E46\u0E81\u0E82\u0E84\u0E87\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA\u0EAB\u0EAD-\u0EB0\u0EB2\u0EB3\u0EBD\u0EC0-\u0EC4\u0EC6\u0EDC\u0EDD\u0F00\u0F40-\u0F47\u0F49-\u0F6C\u0F88-\u0F8B\u1000-\u102A\u103F\u1050-\u1055\u105A-\u105D\u1061\u1065\u1066\u106E-\u1070\u1075-\u1081\u108E\u10A0-\u10C5\u10D0-\u10FA\u10FC\u1100-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u1380-\u138F\u13A0-\u13F4\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7\u17DC\u1820-\u1877\u1880-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191C\u1950-\u196D\u1970-\u1974\u1980-\u19AB\u19C1-\u19C7\u1A00-\u1A16\u1A20-\u1A54\u1AA7\u1B05-\u1B33\u1B45-\u1B4B\u1B83-\u1BA0\u1BAE\u1BAF\u1C00-\u1C23\u1C4D-\u1C4F\u1C5A-\u1C7D\u1CE9-\u1CEC\u1CEE-\u1CF1\u1D00-\u1DBF\u1E00-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2071\u207F\u2090-\u2094\u2102\u2107\u210A-\u2113\u2115\u2119-\u211D\u2124\u2126\u2128\u212A-\u212D\u212F-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2183\u2184\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CEE\u2D00-\u2D25\u2D30-\u2D65\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u2E2F\u3005\u3006\u3031-\u3035\u303B\u303C\u3041-\u3096\u309D-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312D\u3131-\u318E\u31A0-\u31B7\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FCB\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA61F\uA62A\uA62B\uA640-\uA65F\uA662-\uA66E\uA67F-\uA697\uA6A0-\uA6E5\uA717-\uA71F\uA722-\uA788\uA78B\uA78C\uA7FB-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uA840-\uA873\uA882-\uA8B3\uA8F2-\uA8F7\uA8FB\uA90A-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF\uAA00-\uAA28\uAA40-\uAA42\uAA44-\uAA4B\uAA60-\uAA76\uAA7A\uAA80-\uAAAF\uAAB1\uAAB5\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uABC0-\uABE2\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA2D\uFA30-\uFA6D\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE70-\uFE74\uFE76-\uFEFC\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC]/,

	/**
	 * Tags which can safely be merged
	 * @hide
	 */
	mergeableTags: ['b', 'code', 'del', 'em', 'i', 'ins', 'strong', 'sub', 'sup', '#text'],

	/**
	 * Tags which do not mark word boundaries
	 * @hide
	 */
	nonWordBoundaryTags: ['a', 'b', 'code', 'del', 'em', 'i', 'ins', 'span', 'strong', 'sub', 'sup', '#text'],

	/**
	 * Tags which are considered 'nonempty', even if they have no children (or not data)
	 * TODO: finish this list
	 * @hide
	 */
	nonEmptyTags: ['br'],

	/**
	 * Tags which make up Flow Content or Phrasing Content, according to the HTML 5 specification,
	 * @see http://dev.w3.org/html5/spec/Overview.html#flow-content
	 * @see http://dev.w3.org/html5/spec/Overview.html#phrasing-content
	 * @hide
	 */
	tags: {
		'flow' : [ 'a', 'abbr', 'address', 'area', 'article', 'aside', 'audio',
				'b', 'bdo', 'blockquote', 'br', 'button', 'canvas', 'cite', 'code',
				'command', 'datalist', 'del', 'details', 'dfn', 'div', 'dl', 'em',
				'embed', 'fieldset', 'figure', 'footer', 'form', 'h1', 'h2', 'h3',
				'h4', 'h5', 'h6', 'header', 'hgroup', 'hr', 'i', 'iframe', 'img',
				'input', 'ins', 'kbd', 'keygen', 'label', 'map', 'mark', 'math',
				'menu', 'meter', 'nav', 'noscript', 'object', 'ol', 'output', 'p',
				'pre', 'progress', 'q', 'ruby', 'samp', 'script', 'section',
				'select', 'small', 'span', 'strong', 'style', 'sub', 'sup', 'svg',
				'table', 'textarea', 'time', 'ul', 'var', 'video', 'wbr', '#text' ],
		'phrasing' : [ 'a', 'abbr', 'area', 'audio', 'b', 'bdo', 'br', 'button',
				'canvas', 'cite', 'code', 'command', 'datalist', 'del', 'dfn',
				'em', 'embed', 'i', 'iframe', 'img', 'input', 'ins', 'kbd',
				'keygen', 'label', 'map', 'mark', 'math', 'meter', 'noscript',
				'object', 'output', 'progress', 'q', 'ruby', 'samp', 'script',
				'select', 'small', 'span', 'strong', 'sub', 'sup', 'svg',
				'textarea', 'time', 'var', 'video', 'wbr', '#text' ]
	},

	/**
	 * Possible children of tags, according to the HTML 5
	 * specification.
	 * See http://dev.w3.org/html5/spec/Overview.html#elements-1
	 * Moved to http://www.whatwg.org/specs/web-apps/current-work/#elements-1
	 * @hide
	 */
	children: {
		'a' : 'phrasing', // transparent
		'abbr' : 'phrasing',
		'address' : 'flow',
		'area' : 'empty',
		'article' : 'flow',
		'aside' : 'flow',
		'audio' : 'source', // transparent
		'b' : 'phrasing',
		'base' : 'empty',
		'bdo' : 'phrasing',
		'blockquote' : 'phrasing',
		'body' : 'flow',
		'br' : 'empty',
		'button' : 'phrasing',
		'canvas' : 'phrasing', // transparent
		'caption' : 'flow',
		'cite' : 'phrasing',
		'code' : 'phrasing',
		'col' : 'empty',
		'colgroup' : 'col',
		'command' : 'empty',
		'datalist' : ['phrasing', 'option'],
		'dd' : 'flow',
		'del' : 'phrasing',
		'div' : 'flow',
		'details' : ['summary', 'flow'],
		'dfn' : 'flow',
		'dl' : ['dt','dd'],
		'dt' : 'phrasing', // varies
		'em' : 'phrasing',
		'embed' : 'empty',
		'fieldset' : ['legend', 'flow'],
		'figcaption': 'flow',
		'figure' :  ['figcaption', 'flow'],
		'footer' : 'flow',
		'form' : 'flow',
		'h1' : 'phrasing',
		'h2' : 'phrasing',
		'h3' : 'phrasing',
		'h4' : 'phrasing',
		'h5' : 'phrasing',
		'h6' : 'phrasing',
		//head
		'header' : 'flow',
		'hgroup' : ['h1','h2','h3','h4','h5','h6'],
		'hr' : 'empty',
		//html :)
		'i' : 'phrasing',
		'iframe' : '#text',
		'img' : 'empty',
		'input' : 'empty',
		'ins' : 'phrasing', // transparent
		'kbd' : 'phrasing',
		'keygen' : 'empty',
		'label' : 'phrasing',
		'legend' : 'phrasing',
		'li' : 'flow',
		'link' : 'empty',
		'map' : 'area', // transparent
		'mark' : 'phrasing',
		'menu' : ['li', 'flow'],
		'meta' : 'empty',
		'meter' : 'phrasing',
		'nav' : 'flow',
		'noscript' : 'phrasing', // varies
		'object' : 'param', // transparent
		'ol' : 'li',
		'optgroup' : 'option',
		'option' : '#text',
		'output' : 'phrasing',
		'p' : 'phrasing',
		'param' : 'empty',
		'pre' : 'phrasing',
		'progress' : 'phrasing',
		'q' : 'phrasing',
		'rp' : 'phrasing',
		'rt' : 'phrasing',
		'ruby' : ['phrasing', 'rt', 'rp'],
		's' : 'phrasing',
		'samp' : 'pharsing',
		'script' : '#script', //script
		'section' : 'flow',
		'select' : ['option', 'optgroup'],
		'small' : 'phrasing',
		'source' : 'empty',
		'span' : 'phrasing',
		'strong' : 'phrasing',
		'style' : 'phrasing', // varies
		'sub' : 'phrasing',
		'summary' : 'phrasing',
		'sup' : 'phrasing',
		'table' : ['caption', 'colgroup', 'thead', 'tbody', 'tfoot', 'tr'],
		'tbody' : 'tr',
		'td' : 'flow',
		'textarea' : '#text',
		'tfoot' : 'tr',
		'th' : 'phrasing',
		'thead' : 'tr',
		'time' : 'phrasing',
		'title' : '#text',
		'tr' : ['th', 'td'],
		'track' : 'empty',
		'ul' : 'li',
		'var' : 'phrasing',
		'video' : 'source', // transparent
		'wbr' : 'empty'
	},

	/**
	 * List of nodenames of blocklevel elements
	 * TODO: finish this list
	 * @hide
	 */
	blockLevelElements: ['p', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'blockquote', 'div', 'pre'],

	/**
	 * List of nodenames of list elements
	 * @hide
	 */
	listElements: ['li', 'ol', 'ul'],

	/**
	 * Splits a DOM element at the given position up until the limiting object(s), so that it is valid HTML again afterwards.
	 * @param {RangeObject} range Range object that indicates the position of the splitting.
	 *				This range will be updated, so that it represents the same range as before the split.
	 * @param {jQuery} limit Limiting node(s) for the split.
	 *				The limiting node will not be included in the split itself.
	 *				If no limiting object is set, the document body will be the limiting object.
	 * @param {boolean} atEnd If set to true, the DOM will be splitted at the end of the range otherwise at the start.
	 * @return {object} jQuery object containing the two root DOM objects of the split, true if the DOM did not need to be split or false if the DOM could not be split
	 * @method
	 */
	split: function (range, limit, atEnd) {
		var
			splitElement = jQuery(range.startContainer),
			splitPosition = range.startOffset,
			updateRange, path, parents,
			newDom, insertElement, secondPart,
			i, pathLength, element, jqelement, children, newElement,
			next, prev, offset;


		if (atEnd) {
			splitElement = jQuery(range.endContainer);
			splitPosition = range.endOffset;
		}

		if (limit.length < 1) {
			limit = jQuery(document.body);
		}

		// we may have to update the range if it is not collapsed and we are splitting at the start
		updateRange = (!range.isCollapsed() && !atEnd);

		// find the path up to the highest object that will be splitted
		parents = splitElement.parents().get();
		parents.unshift(splitElement.get(0));

		jQuery.each(parents, function(index, element) {
			var isLimit = limit.filter(
					function(){
						return this == element;
					}).length;
			if (isLimit) {
				if (index > 0) {
					path = parents.slice(0, index);
				}
				return false;
			}
		});

		// nothing found to split -> return here
		if (! path) {
			return true;
		}

		path = path.reverse();

		// iterate over the path, create new dom nodes for every element and move
		// the contents right of the split to the new element
		for( i=0, pathLength = path.length; i < pathLength; ++i) {
			element = path[i];
			if (i === pathLength - 1) {
				// last element in the path -> we have to split it

				// split the last part into two parts
				if (element.nodeType === 3) {
					// text node
					secondPart = document.createTextNode(element.data.substring(splitPosition, element.data.length));
					element.data = element.data.substring(0, splitPosition);
				} else {
					// other nodes
					jqelement = jQuery(element);
					children = jqelement.contents();
					newElement = jqelement.clone(false).empty();
					secondPart = newElement.append(children.slice(splitPosition, children.length)).get(0);
				}

				// update the range if necessary
				if (updateRange && range.endContainer === element) {
					range.endContainer = secondPart;
					range.endOffset -= splitPosition;
					range.clearCaches();
				}

				// add the second part
				if (insertElement) {
					insertElement.prepend(secondPart);
				} else {
					jQuery(element).after(secondPart);
				}
			} else {
				// create the new element of the same type and prepend it to the previously created element
				newElement = jQuery(element).clone(false).empty();

				if (!newDom) {
					newDom = newElement;
				} else {
					insertElement.prepend(newElement);
				}
				insertElement = newElement;

				// move all contents right of the split to the new element
				while ( true ) {
					next = path[i+1].nextSibling;
					if ( !next ) { break; }
					insertElement.append(next);
				}

				// update the range if necessary
				if (updateRange && range.endContainer === element) {
					range.endContainer = newElement.get(0);
					prev = path[i+1];
					offset = 0;
					while ( true ) {
						prev = prev.previousSibling;
						if ( !prev ) { break; }
						offset++;
					}
					range.endOffset -= offset;
					range.clearCaches();
				}
			}
		}

		// append the new dom
		jQuery(path[0]).after(newDom);

		return jQuery([path[0], newDom ? newDom.get(0) : secondPart]);
	},

	/**
	 * Check whether the HTML 5 specification allows direct nesting of the given DOM
	 * objects.
	 * @param {object} outerDOMObject
	 *            outer (nesting) DOM Object
	 * @param {object} innerDOMObject
	 *            inner (nested) DOM Object
	 * @return {boolean} true when the nesting is allowed, false if not
	 * @method
	 */
	allowsNesting: function (outerDOMObject, innerDOMObject) {
		if (!outerDOMObject || !outerDOMObject.nodeName || !innerDOMObject
				|| !innerDOMObject.nodeName) {
			return false;
		}

		var outerNodeName = outerDOMObject.nodeName.toLowerCase(),
			innerNodeName = innerDOMObject.nodeName.toLowerCase();

		if (!this.children[outerNodeName]) {
			return false;
		}

		// check whether the nesting is configured by node names (like for table)
		if (this.children[outerNodeName] == innerNodeName) {
			return true;
		}
		if (jQuery.isArray(this.children[outerNodeName])
				&& jQuery.inArray(innerNodeName, this.children[outerNodeName]) >= 0) {
			return true;
		}

		if (jQuery.isArray(this.tags[this.children[outerNodeName]])
				&& jQuery.inArray(innerNodeName,
						this.tags[this.children[outerNodeName]]) >= 0) {
			return true;
		}

		return false;
	},

	/**
	 * Apply the given markup additively to the given range. The given rangeObject will be modified if necessary
	 * @param {GENTICS.Utils.RangeObject} rangeObject range to which the markup shall be added
	 * @param {jQuery} markup markup to be applied as jQuery object
	 * @param {boolean} allownesting true when nesting of the added markup is allowed, false if not (default: false)
	 * @method
	 */
	addMarkup: function (rangeObject, markup, nesting) {
		// split partially contained text nodes at the start and end of the range
		if (rangeObject.startContainer.nodeType === 3 && rangeObject.startOffset > 0
				&& rangeObject.startOffset < rangeObject.startContainer.data.length) {
			this.split(rangeObject, jQuery(rangeObject.startContainer).parent(),
				false);
		}
		if (rangeObject.endContainer.nodeType === 3 && rangeObject.endOffset > 0
				&& rangeObject.endOffset < rangeObject.endContainer.data.length) {
			this.split(rangeObject, jQuery(rangeObject.endContainer).parent(),
				true);
		}

		// get the range tree
		var rangeTree = rangeObject.getRangeTree();
		this.recursiveAddMarkup(rangeTree, markup, rangeObject, nesting);

		// cleanup DOM
		this.doCleanup({'merge' : true, 'removeempty' : true}, rangeObject);
	},

	/**
	 * Recursive helper method to add the given markup to the range
	 * @param rangeTree rangetree at the current level
	 * @param markup markup to be applied
	 * @param rangeObject range object, which eventually is updated
	 * @param nesting true when nesting of the added markup is allowed, false if not
	 * @hide
	 */
	recursiveAddMarkup: function (rangeTree, markup, rangeObject, nesting) {
		var i, innerRange, rangeLength;

		// iterate through all rangetree objects of that level
		for ( i = 0, rangeLength = rangeTree.length; i < rangeLength; ++i) {
			// check whether the rangetree object is fully contained and the markup may be wrapped around the object
			if (rangeTree[i].type == 'full' && this.allowsNesting(markup.get(0), rangeTree[i].domobj)) {
				// we wrap the object, when
				// 1. nesting of markup is allowed or the node is not of the markup to be added
				// 2. the node an element node or a non-empty text node
				if ((nesting || rangeTree[i].domobj.nodeName != markup.get(0).nodeName)
						&& (rangeTree[i].domobj.nodeType !== 3 || jQuery
								.trim(rangeTree[i].domobj.data).length !== 0)) {
					// wrap the object
					jQuery(rangeTree[i].domobj).wrap(markup);

					// TODO eventually update the range (if it changed)

					// when nesting is not allowed, we remove the markup from the inner element
					if (!nesting && rangeTree[i].domobj.nodeType !== 3) {
						innerRange = new GENTICS.Utils.RangeObject();
						innerRange.startContainer = innerRange.endContainer = rangeTree[i].domobj.parentNode;
						innerRange.startOffset = 0;
						innerRange.endOffset = innerRange.endContainer.childNodes.length;
						this.removeMarkup(innerRange, markup, jQuery(rangeTree[i].domobj.parentNode));
					}
				}
			} else {
				// TODO check whether the object may be replaced by the given markup
				if (false) {
					// TODO replace
				} else {
					// recurse into the children (if any), but not if nesting is not
					// allowed and the object is of the markup to be added
					if ((nesting || (rangeTree[i].domobj && rangeTree[i].domobj.nodeName !== markup.get(0).nodeName))
						&& rangeTree[i].children && rangeTree[i].children.length > 0) {
						this.recursiveAddMarkup(rangeTree[i].children, markup);
					}
				}
			}
		}
	},

	/**
	 * Find the highest occurrence of a node with given nodename within the parents
	 * of the start. When limit objects are given, the search stops there.
	 * The limiting object is of the found type, it won't be considered
	 * @param {DOMObject} start start object
	 * @param {String} nodeName name of the node to search for (case-insensitive)
	 * @param {jQuery} limit Limiting node(s) as jQuery object (if none given, the search will stop when there are no more parents)
	 * @return {DOMObject} the found DOM object or undefined
	 * @method
	 */
	findHighestElement: function (start, nodeName, limit) {
		nodeName = nodeName.toLowerCase();

		// this will be the highest found markup object (up to a limit object)
		var highestObject,
		// blah
			testObject = start,
		// helper function to stop when we reach a limit object
			isLimit = limit ? function () {
			return limit.filter(
					function() {
						return testObject == this;
					}
			).length;
		} : function () {
			return false;
		};

		// now get the highest parent that has the given markup (until we reached
		// one of the limit objects or there are no more parent nodes)
		while (!isLimit() && testObject) {
			if (testObject.nodeName.toLowerCase() === nodeName) {
				highestObject = testObject;
			}
			testObject = testObject.parentNode;
		}

		return highestObject;
	},

	/**
	 * Remove the given markup from the given range. The given rangeObject will be modified if necessary
	 * TODO: add parameter deep/shallow
	 * @param {GENTICS.Utils.RangeObject} rangeObject range from which the markup shall be removed
	 * @param {jQuery} markup markup to be removed as jQuery object
	 * @param {jQuery} limit Limiting node(s) as jQuery object
	 * @method
	 */
	removeMarkup: function (rangeObject, markup, limit) {
		var nodeName = markup.get(0).nodeName,
			startSplitLimit = this.findHighestElement(rangeObject.startContainer, nodeName, limit),
			endSplitLimit = this.findHighestElement(rangeObject.endContainer, nodeName, limit),
			didSplit = false,
			highestObject, root, rangeTree;

		if (startSplitLimit && rangeObject.startOffset > 0) {
			// when the start is in the start of its container, we don't split
			this.split(rangeObject, jQuery(startSplitLimit).parent(), false);
			didSplit = true;
		}

		if (endSplitLimit) {
			// when the end is in the end of its container, we don't split
			if (rangeObject.endContainer.nodeType === 3 && rangeObject.endOffset < rangeObject.endContainer.data.length) {
				this.split(rangeObject, jQuery(endSplitLimit).parent(), true);
				didSplit = true;
			}
			if (rangeObject.endContainer.nodeType === 1 && rangeObject.endOffset < rangeObject.childNodes.length) {
				this.split(rangeObject, jQuery(endSplitLimit).parent(), true);
				didSplit = true;
			}
		}

		// when we split the DOM, we maybe need to correct the range
		if (didSplit) {
			rangeObject.correctRange();
		}

		// find the highest occurrence of the markup
		highestObject = this.findHighestElement(rangeObject.getCommonAncestorContainer(), nodeName, limit);
		root = highestObject ? highestObject.parentNode : rangeObject.getCommonAncestorContainer();

		if (root) {
			// construct the range tree
			rangeTree = rangeObject.getRangeTree(root);
	
			// remove the markup from the range tree
			this.recursiveRemoveMarkup(rangeTree, markup);
	
			// cleanup DOM
			this.doCleanup({'merge' : true, 'removeempty' : true}, rangeObject, root);
		}
	},

	/**
	 * TODO: pass the range itself and eventually update it if necessary
	 * Recursive helper method to remove the given markup from the range
	 * @param rangeTree rangetree at the current level
	 * @param markup markup to be applied
	 * @hide
	 */
	recursiveRemoveMarkup: function (rangeTree, markup) {
		var i, rangeLength, content;
		// iterate over the rangetree objects of this level
		for (i = 0, rangeLength = rangeTree.length; i < rangeLength; ++i) {
			// check whether the object is the markup to be removed and is fully into the range
			if (rangeTree[i].type == 'full' && rangeTree[i].domobj.nodeName == markup.get(0).nodeName) {
				// found the markup, so remove it
				content = jQuery(rangeTree[i].domobj).contents();
				if (content.length > 0) {
					// when the object has children, we unwrap them
					content.first().unwrap();
				} else {
					// obj has no children, so just remove it
					jQuery(rangeTree[i].domobj).remove();
				}
			}

			// if the object has children, we do the recursion now
			if (rangeTree[i].children) {
				this.recursiveRemoveMarkup(rangeTree[i].children, markup);
			}
		}
	},

	/**
	 * Cleanup the DOM, starting with the given startobject (or the common ancestor container of the given range)
	 * ATTENTION: If range is a selection you need to update the selection after doCleanup
	 * Cleanup modes (given as properties in 'cleanup'):
	 * <pre>
	 * - merge: merges multiple successive nodes of same type, if this is allowed, starting at the children of the given node (defaults to false)
	 * - removeempty: removes empty element nodes (defaults to false)
	 * </pre>
	 * Example for calling this method:<br/>
	 * <code>GENTICS.Utils.Dom.doCleanup({merge:true,removeempty:false}, range)</code>
	 * @param {object} cleanup type of cleanup to be done
	 * @param {GENTICS.Utils.RangeObject} rangeObject range which is eventually updated
	 * @param {DOMObject} start start object, if not given, the commonancestorcontainer is used as startobject insted
	 * @return {boolean} true when the range (startContainer/startOffset/endContainer/endOffset) was modified, false if not
	 * @method
	 */
	doCleanup: function(cleanup, rangeObject, start) {
		var that = this, prevNode, modifiedRange, startObject, startOffset, endOffset;

		if (typeof cleanup === 'undefined') {
			cleanup = {};
		}
		if (typeof cleanup.merge === 'undefined') {
			cleanup.merge = false;
		}
		if (typeof cleanup.removeempty === 'undefined') {
			cleanup.removeempty = false;
		}

		if (typeof start === 'undefined' && rangeObject) {
			start = rangeObject.getCommonAncestorContainer();
		}
		// remember the previous node here (successive nodes of same type will be merged into this)
		prevNode = false;
		// check whether the range needed to be modified during merging
		modifiedRange = false;
		// get the start object
		startObject = jQuery(start);
		startOffset = rangeObject.startOffset;
		endOffset = rangeObject.endOffset;

		// iterate through all sub nodes
		startObject.contents().each(function(index) {
			// decide further actions by node type
			switch(this.nodeType) {
			// found a non-text node
			case 1:
				if (prevNode && prevNode.nodeName == this.nodeName) {
					// found a successive node of same type

					// now we check whether the selection starts or ends in the mother node after the current node
					if (rangeObject.startContainer === startObject && startOffset > index) {
						// there will be one less object, so reduce the startOffset by one
						rangeObject.startOffset -= 1;
						// set the flag for range modification
						modifiedRange = true;
					}
					if (rangeObject.endContainer === startObject && endOffset > index) {
						// there will be one less object, so reduce the endOffset by one
						rangeObject.endOffset -= 1;
						// set the flag for range modification
						modifiedRange = true;
					}

					// merge the contents of this node into the previous one
					jQuery(prevNode).append(jQuery(this).contents());

					// after merging, we eventually need to cleanup the prevNode again
					modifiedRange |= that.doCleanup(cleanup, rangeObject, prevNode);

					// remove this node
					jQuery(this).remove();
					
				} else {
					
					// do the recursion step here
					modifiedRange |= that.doCleanup(cleanup, rangeObject, this);

					// eventually remove empty elements
					var removed = false;
					if (cleanup.removeempty) {
						if (GENTICS.Utils.Dom.isBlockLevelElement(this) && this.childNodes.length === 0) {
//							jQuery(this).remove();
							removed = true;
						}
						if (jQuery.inArray(this.nodeName.toLowerCase(), that.mergeableTags) >= 0
								&& jQuery(this).text().length === 0 && this.childNodes.length === 0) {
//							jQuery(this).remove();
							removed = true;
						}
					}

					// when the current node was not removed, we eventually store it as previous (mergeable) tag
					if (!removed) {
						if (jQuery.inArray(this.nodeName.toLowerCase(), that.mergeableTags) >= 0) {
							prevNode = this;
						} else {
							prevNode = false;
						}
					} else {
						// now we check whether the selection starts or ends in the mother node of this
						if (rangeObject.startContainer === this.parentNode && startOffset > index) {
							// there will be one less object, so reduce the startOffset by one
							rangeObject.startOffset = rangeObject.startOffset - 1;
							// set the flag for range modification
							modifiedRange = true;
						}
						if (rangeObject.endContainer === this.parentNode && endOffset > index) {
							// there will be one less object, so reduce the endOffset by one
							rangeObject.endOffset = rangeObject.endOffset - 1;
							// set the flag for range modification
							modifiedRange = true;
						}
										
						// remove this text node
						jQuery(this).remove();

					}
				}

				break;
			// found a text node
			case 3:
				// found a text node
				if (prevNode && prevNode.nodeType === 3 && cleanup.merge) {
					// the current text node will be merged into the last one, so
					// check whether the selection starts or ends in the current
					// text node
					if (rangeObject.startContainer === this) {
						// selection starts in the current text node

						// update the start container to the last node
						rangeObject.startContainer = prevNode;

						// update the start offset
						rangeObject.startOffset += prevNode.nodeValue.length;

						// set the flag for range modification
						modifiedRange = true;
						
					} else if (rangeObject.startContainer === prevNode.parentNode
							&& rangeObject.startOffset === that.getIndexInParent(prevNode) + 1) {
						// selection starts right between the previous and current text nodes (which will be merged)

						// update the start container to the previous node
						rangeObject.startContainer = prevNode;

						// set the start offset
						rangeObject.startOffset = prevNode.nodeValue.length;

						// set the flag for range modification
						modifiedRange = true;
					}

					if (rangeObject.endContainer === this) {
						// selection ends in the current text node

						// update the end container to be the last node
						rangeObject.endContainer = prevNode;

						// update the end offset
						rangeObject.endOffset += prevNode.nodeValue.length;

						// set the flag for range modification
						modifiedRange = true;

					} else if (rangeObject.endContainer === prevNode.parentNode
							&& rangeObject.endOffset === that.getIndexInParent(prevNode) + 1) {
						// selection ends right between the previous and current text nodes (which will be merged)

						// update the end container to the previous node
						rangeObject.endContainer = prevNode;

						// set the end offset
						rangeObject.endOffset = prevNode.nodeValue.length;

						// set the flag for range modification
						modifiedRange = true;
					}

					// now append the contents of the current text node into the previous
					prevNode.data += this.data;

				// remove empty text nodes	
				} else if ( this.nodeValue === '' && cleanup.removeempty ) {
					// do nothing here.
					
				// remember it as the last text node if not empty
				} else if ( !(this.nodeValue === '' && cleanup.removeempty) ) {
					prevNode = this;
					// we are finish here don't delete this node
					break;
				}

				// now we check whether the selection starts or ends in the mother node of this
				if (rangeObject.startContainer === this.parentNode && rangeObject.startOffset > index) {
					// there will be one less object, so reduce the startOffset by one
					rangeObject.startOffset = rangeObject.startOffset - 1;
					// set the flag for range modification
					modifiedRange = true;
				}
				if (rangeObject.endContainer === this.parentNode && rangeObject.endOffset > index) {
					// there will be one less object, so reduce the endOffset by one
					rangeObject.endOffset = rangeObject.endOffset - 1;
					// set the flag for range modification
					modifiedRange = true;
				}

				// remove this text node
				jQuery(this).remove();

				break;
			}
		});

		// eventually remove the startnode itself
//		if (cleanup.removeempty
//				&& GENTICS.Utils.Dom.isBlockLevelElement(start)
//				&& (!start.childNodes || start.childNodes.length === 0)) {
//			if (rangeObject.startContainer == start) {
//				rangeObject.startContainer = start.parentNode;
//				rangeObject.startOffset = GENTICS.Utils.Dom.getIndexInParent(start);
//			}
//			if (rangeObject.endContainer == start) {
//				rangeObject.endContainer = start.parentNode;
//				rangeObject.endOffset = GENTICS.Utils.Dom.getIndexInParent(start);
//			}
//			startObject.remove();
//			modifiedRange = true;
//		}

		if (modifiedRange) {
			rangeObject.clearCaches();
		}

		return modifiedRange;
	},

	/**
	 * Get the index of the given node within its parent node
	 * @param {DOMObject} node node to check
	 * @return {Integer} index in the parent node or false if no node given or node has no parent
	 * @method
	 */
	getIndexInParent: function (node) {
		if (!node) {
			return false;
		}

		var
			index = 0,
			check = node.previousSibling;

		while(check) {
			index++;
			check = check.previousSibling;
		}

		return index;
	},

	/**
	 * Check whether the given node is a blocklevel element
	 * @param {DOMObject} node node to check
	 * @return {boolean} true if yes, false if not (or null)
	 * @method
	 */
	isBlockLevelElement: function (node) {
		if (!node) {
			return false;
		}
		if (node.nodeType === 1 && jQuery.inArray(node.nodeName.toLowerCase(), this.blockLevelElements) >= 0) {
			return true;
		} else {
			return false;
		}
	},

	/**
	 * Check whether the given node is a linebreak element
	 * @param {DOMObject} node node to check
	 * @return {boolean} true for linebreak elements, false for everything else
	 * @method
	 */
	isLineBreakElement: function (node) {
		if (!node) {
			return false;
		}
		return node.nodeType === 1 && node.nodeName.toLowerCase() == 'br';
	},

	/**
	 * Check whether the given node is a list element
	 * @param {DOMObject} node node to check
	 * @return {boolean} true for list elements (li, ul, ol), false for everything else
	 * @method
	 */
	isListElement: function (node) {
		if (!node) {
			return false;
		}
		return node.nodeType === 1 && jQuery.inArray(node.nodeName.toLowerCase(), this.listElements) >= 0;
	},

	/**
	 * This method checks, whether the passed dom object is a dom object, that would
	 * be split in cases of pressing enter. This currently is true for paragraphs
	 * and headings
	 * @param {DOMObject} el
	 *            dom object to check
	 * @return {boolean} true for split objects, false for other
	 * @method
	 */
	isSplitObject: function(el) {
		if (el.nodeType === 1){
			switch(el.nodeName.toLowerCase()) {
			case 'p':
			case 'h1':
			case 'h2':
			case 'h3':
			case 'h4':
			case 'h5':
			case 'h6':
			case 'li':
				return true;
			}
		}
		return false;
	},

	/**
	 * Starting with the given position (between nodes), search in the given direction to an adjacent notempty text node
	 * @param {DOMObject} parent parent node containing the position
	 * @param {Integer} index index of the position within the parent node
	 * @param {boolean} searchleft true when search direction is 'left' (default), false for 'right'
	 * @param {object} stopat define at which types of element we shall stop, may contain the following properties
	 * <pre>
	 * - blocklevel (default: true)
	 * - list (default: true)
	 * - linebreak (default: true)
	 * </pre>
	 * @return {DOMObject} the found text node or false if none found
	 * @method
	 */
	searchAdjacentTextNode: function (parent, index, searchleft, stopat) {
		if (!parent || parent.nodeType !== 1 || index < 0 || index > parent.childNodes.length) {
			return false;
		}

		if (typeof stopat === 'undefined') {
			stopat = {'blocklevel' : true, 'list' : true, 'linebreak' : true};
		}

		if (typeof stopat.blocklevel === 'undefined') {
			stopat.blocklevel = true;
		}
		if (typeof stopat.list === 'undefined') {
			stopat.list = true;
		}
		if (typeof stopat.linebreak === 'undefined') {
			stopat.linebreak = true;
		}

		if (typeof searchleft === 'undefined') {
			searchleft = true;
		}

		var
			nextNode,
			currentParent = parent;

		// start at the node left/right of the given position
		if (searchleft && index > 0) {
			nextNode = parent.childNodes[index - 1];
		}
		if (!searchleft && index < parent.childNodes.length) {
			nextNode = parent.childNodes[index];
		}
		
		//currentParent is not a number therefore it is sufficient to directly test for it with while(currentParent)
		//otherwise there would be an error if the object is null
		while (currentParent) {
		//while (typeof currentParent !== 'undefined') {
			if (!nextNode) {
				// no next node found, check whether the parent is a blocklevel element
				if (stopat.blocklevel && this.isBlockLevelElement(currentParent)) {
					// do not leave block level elements
					return false;
				} else if (stopat.list && this.isListElement(currentParent)) {
					// do not leave list elements
					return false;
				} else {
					// continue with the parent
					nextNode = searchleft ? currentParent.previousSibling : currentParent.nextSibling;
					currentParent = currentParent.parentNode;
				}
			} else if (nextNode.nodeType === 3 && jQuery.trim(nextNode.data).length > 0) {
				// we are lucky and found a notempty text node
				return nextNode;
			} else if (stopat.blocklevel && this.isBlockLevelElement(nextNode)) {
				// we found a blocklevel element, stop here
				return false;
			} else if (stopat.linebreak && this.isLineBreakElement(nextNode)) {
				// we found a linebreak, stop here
				return false;
			} else if (stopat.list && this.isListElement(nextNode)) {
				// we found a linebreak, stop here
				return false;
			} else if (nextNode.nodeType === 3) {
				// we found an empty text node, so step to the next
				nextNode = searchleft ? nextNode.previousSibling : nextNode.nextSibling;
			} else {
				// we found a non-blocklevel element, step into
				currentParent = nextNode;
				nextNode = searchleft ? nextNode.lastChild : nextNode.firstChild;
			}
		}
	},

	/**
	 * Insert the given DOM Object into the start/end of the given range. The method
	 * will find the appropriate place in the DOM tree for inserting the given
	 * object, and will eventually split elements in between. The given range will
	 * be updated if necessary. The updated range will NOT embrace the inserted
	 * object, which means that the object is actually inserted before or after the
	 * given range (depending on the atEnd parameter)
	 *
	 * @param {jQuery}
	 *				object object to insert into the DOM
	 * @param {GENTICS.Utils.RangeObject}
	 *				range range where to insert the object (at start or end)
	 * @param {jQuery}
	 *				limit limiting object(s) of the DOM modification
	 * @param {boolean}
	 *				atEnd true when the object shall be inserted at the end, false for
	 *				insertion at the start (default)
	 * @param {boolean}
	 *				true when the insertion shall be done, even if inserting the element
	 *				would not be allowed, false to deny inserting unallowed elements (default)
	 * @return true if the object could be inserted, false if not.
	 * @method
	 */
	insertIntoDOM: function (object, range, limit, atEnd, force) {
		// first find the appropriate place to insert the given object
		var parentElements = range.getContainerParents(limit, atEnd),
			that = this,
			newParent,
			container, offset, splitParts, contents;

		if (!limit) {
			limit = jQuery(document.body);
		}

		// if no parent elements exist (up to the limit), the new parent will be the
		// limiter itself
		if (parentElements.length === 0) {
			newParent = limit.get(0);
		} else {
			jQuery.each(parentElements, function (index, parent) {
				if (that.allowsNesting(parent, object.get(0))) {
					newParent = parent;
					return false;
				}
			});
		}

		if (typeof newParent === 'undefined' && limit.length > 0) {
			// found no possible new parent, so split up to the limit object
			newParent = limit.get(0);
		}

		// check whether it is allowed to insert the element at all
		if (!this.allowsNesting(newParent, object.get(0)) && !force) {
			return false;
		}

		if (typeof newParent !== 'undefined') {
			// we found a possible new parent, so we split the DOM up to the new parent
			splitParts = this.split(range, jQuery(newParent), atEnd);
			if (splitParts === true) {
				// DOM was not split (there was no need to split it), insert the new object anyway
				container = range.startContainer;
				offset = range.startOffset;
				if (atEnd) {
					container = range.endContainer;
					offset = range.endOffset;
				}
				if (offset === 0) {
					// insert right before the first element in the container
					contents = jQuery(container).contents();
					if (contents.length > 0) {
						contents.eq(0).before(object);
					} else {
						jQuery(container).append(object);
					}
					return true;
				} else {
					// insert right after the element at offset-1
					jQuery(container).contents().eq(offset-1).after(object);
					return true;
				}
			} else if (splitParts) {
				// if the DOM could be split, we insert the new object in between the split parts
				splitParts.eq(0).after(object);
				return true;
			} else {
				// could not split, so could not insert
				return false;
			}
		} else {
			// found no possible new parent, so we shall not insert
			return false;
		}
	},

	/**
	 * Remove the given DOM object from the DOM and modify the given range to reflect the user expected range after the object was removed
	 * TODO: finish this
	 * @param {DOMObject} object DOM object to remove
	 * @param {GENTICS.Utils.RangeObject} range range which eventually be modified
	 * @param {boolean} preserveContent true if the contents of the removed DOM object shall be preserved, false if not (default: false)
	 * @return true if the DOM object could be removed, false if not
	 * @hide
	 */
	removeFromDOM: function (object, range, preserveContent) {
		if (preserveContent) {
			// check whether the range will need modification
			var indexInParent = this.getIndexInParent(object),
				numChildren = jQuery(object).contents().length,
				parent = object.parentNode;

			if (range.startContainer == parent && range.startOffset > indexInParent) {
				range.startOffset += numChildren - 1;
			} else if (range.startContainer == object) {
				range.startContainer = parent;
				range.startOffset = indexInParent + range.startOffset;
			}

			if (range.endContainer == parent && range.endOffset > indexInParent) {
				range.endOffset += numChildren - 1;
			} else if (range.endContainer == object) {
				range.endContainer = parent;
				range.endOffset = indexInParent + range.endOffset;
			}

			// we simply unwrap the children of the object
			jQuery(object).contents().unwrap();

			// optionally do cleanup
			this.doCleanup({'merge' : true}, range, parent);
		} else {
			// TODO
		}
	},

	/**
	 * Remove the content defined by the given range from the DOM. Update the given
	 * range object to be a collapsed selection at the place of the previous
	 * selection.
	 * @param rangeObject range object
	 * @return true if the range could be removed, false if not
	 */
	removeRange: function (rangeObject) {
		if (!rangeObject) {
			// no range given
			return false;
		}
		if (rangeObject.isCollapsed()) {
			// the range is collapsed, nothing to delete
			return false;
		}

		// split partially contained text nodes at the start and end of the range
		if (rangeObject.startContainer.nodeType == 3 && rangeObject.startOffset > 0
			&& rangeObject.startOffset < rangeObject.startContainer.data.length) {
			this.split(rangeObject, jQuery(rangeObject.startContainer).parent(),
					   false);
		}
		if (rangeObject.endContainer.nodeType == 3 && rangeObject.endOffset > 0
			&& rangeObject.endOffset < rangeObject.endContainer.data.length) {
			this.split(rangeObject, jQuery(rangeObject.endContainer).parent(),
					   true);
		}

		// construct the range tree
		var rangeTree = rangeObject.getRangeTree();

		// collapse the range
		rangeObject.endContainer = rangeObject.startContainer;
		rangeObject.endOffset = rangeObject.startOffset;

		// remove the markup from the range tree
		this.recursiveRemoveRange(rangeTree, rangeObject);

		// do some cleanup
		this.doCleanup({'merge' : true}, rangeObject);
//		this.doCleanup({'merge' : true, 'removeempty' : true}, rangeObject);

		// clear the caches of the range object
		rangeObject.clearCaches();
	},

	recursiveRemoveRange: function (rangeTree, rangeObject) {
		// iterate over the rangetree objects of this level
		for (var i = 0; i < rangeTree.length; ++i) {
			// check for nodes fully in the range
			if (rangeTree[i].type == 'full') {
				// if the domobj is the startcontainer, or the startcontainer is inside the domobj, we need to update the rangeObject
				if (jQuery(rangeObject.startContainer).parents().andSelf().filter(rangeTree[i].domobj).length > 0) {
					rangeObject.startContainer = rangeObject.endContainer = rangeTree[i].domobj.parentNode;
					rangeObject.startOffset = rangeObject.endOffset = this.getIndexInParent(rangeTree[i].domobj);
				}

				// remove the object from the DOM
				jQuery(rangeTree[i].domobj).remove();
			} else if (rangeTree[i].type == 'partial' && rangeTree[i].children) {
				// node partially selected and has children, so do recursion
				this.recursiveRemoveRange(rangeTree[i].children, rangeObject);
			}
		}
	},

	/**
	 * Extend the given range to have start and end at the nearest word boundaries to the left (start) and right (end)
	 * @param {GENTICS.Utils.RangeObject} range range to be extended
	 * @param {boolean} fromBoundaries true if extending will also be done, if one or both ends of the range already are at a word boundary, false if not, default: false
	 * @method
	 */
	extendToWord: function (range, fromBoundaries) {
		// search the word boundaries to the left and right
		var leftBoundary = this.searchWordBoundary(range.startContainer, range.startOffset, true),
			rightBoundary = this.searchWordBoundary(range.endContainer, range.endOffset, false);

		// check whether we must not extend the range from word boundaries
		if (!fromBoundaries) {
			// we only extend the range if both ends would be different
			if (range.startContainer == leftBoundary.container && range.startOffset == leftBoundary.offset) {
				return;
			}
			if (range.endContainer == rightBoundary.container && range.endOffset == rightBoundary.offset) {
				return;
			}
		}

		// set the new boundaries
		range.startContainer = leftBoundary.container;
		range.startOffset = leftBoundary.offset;
		range.endContainer = rightBoundary.container;
		range.endOffset = rightBoundary.offset;

		// correct the range
		range.correctRange();

		// clear caches
		range.clearCaches();
	},

	/**
	 * Helper method to check whether the given DOM object is a word boundary.
	 * @param {DOMObject} object DOM object in question
	 * @return {boolean} true when the DOM object is a word boundary, false if not
	 * @hide
	 */
	isWordBoundaryElement: function (object) {
		if (!object || !object.nodeName) {
			return false;
		}
		return jQuery.inArray(object.nodeName.toLowerCase(), this.nonWordBoundaryTags) == -1;
	},

	/**
	 * Search for the next word boundary, starting at the given position
	 * @param {DOMObject} container container of the start position
	 * @param {Integer} offset offset of the start position
	 * @param {boolean} searchleft true for searching to the left, false for searching to the right (default: true)
	 * @return {object} object with properties 'container' and 'offset' marking the found word boundary
	 * @method
	 */
	searchWordBoundary: function (container, offset, searchleft) {
		if (typeof searchleft === 'undefined') {
			searchleft = true;
		}
		var boundaryFound = false, wordBoundaryPos, tempWordBoundaryPos, textNode;
		while (!boundaryFound) {
			// check the node type
			if (container.nodeType === 3) {
				// we are currently in a text node

				// find the nearest word boundary character
				if (!searchleft) {
					// search right
					wordBoundaryPos = container.data.substring(offset).search(this.nonWordRegex);
					if (wordBoundaryPos != -1) {
						// found a word boundary
						offset = offset + wordBoundaryPos;
						boundaryFound = true;
					} else {
						// found no word boundary, so we set the position after the container
						offset = this.getIndexInParent(container) + 1;
						container = container.parentNode;
					}
				} else {
					// search left
					wordBoundaryPos = container.data.substring(0, offset).search(this.nonWordRegex);
					tempWordBoundaryPos = wordBoundaryPos;
					while (tempWordBoundaryPos != -1) {
						wordBoundaryPos = tempWordBoundaryPos;
						tempWordBoundaryPos = container.data.substring(
								wordBoundaryPos + 1, offset).search(this.nonWordRegex);
						if (tempWordBoundaryPos != -1) {
							tempWordBoundaryPos = tempWordBoundaryPos + wordBoundaryPos + 1;
						}
					}

					if (wordBoundaryPos != -1) {
						// found a word boundary
						offset = wordBoundaryPos + 1;
						boundaryFound = true;
					} else {
						// found no word boundary, so we set the position before the container
						offset = this.getIndexInParent(container);
						container = container.parentNode;
					}
				}
			} else if (container.nodeType === 1) {
				// we are currently in an element node (between nodes)

				if (!searchleft) {
					// check whether there is an element to the right
					if (offset < container.childNodes.length) {
						// there is an element to the right, check whether it is a word boundary element
						if (this.isWordBoundaryElement(container.childNodes[offset])) {
							// we are done
							boundaryFound = true;
						} else {
							// element to the right is no word boundary, so enter it
							container = container.childNodes[offset];
							offset = 0;
						}
					} else {
						// no element to the right, check whether the element itself is a boundary element
						if (this.isWordBoundaryElement(container)) {
							// we are done
							boundaryFound = true;
						} else {
							// element itself is no boundary element, so go to parent
							offset = this.getIndexInParent(container) + 1;
							container = container.parentNode;
						}
					}
				} else {
					// check whether there is an element to the left
					if (offset > 0) {
						// there is an element to the left, check whether it is a word boundary element
						if (this.isWordBoundaryElement(container.childNodes[offset - 1])) {
							// we are done
							boundaryFound = true;
						} else {
							// element to the left is no word boundary, so enter it
							container = container.childNodes[offset - 1];
							offset = container.nodeType === 3 ? container.data.length : container.childNodes.length;
						}
					} else {
						// no element to the left, check whether the element itself is a boundary element
						if (this.isWordBoundaryElement(container)) {
							// we are done
							boundaryFound = true;
						} else {
							// element itself is no boundary element, so go to parent
							offset = this.getIndexInParent(container);
							container = container.parentNode;
						}
					}
				}
			}
		}

		if (container.nodeType !== 3) {
			textNode = this.searchAdjacentTextNode(container, offset, !searchleft);
			if (textNode) {
				container = textNode;
				offset = searchleft ? 0 : container.data.length;
			}
		}

		return {'container' : container, 'offset' : offset};
	},

	/**
	 * Check whether the given dom object is empty
	 * @param {DOMObject} domObject object to check
	 * @return {boolean} true when the object is empty, false if not
	 * @method
	 */
	isEmpty: function (domObject) {
		// a non dom object is considered empty
		if (!domObject) {
			return true;
		}

		// some tags are considered to be non-empty
		if (jQuery.inArray(domObject.nodeName.toLowerCase(), this.nonEmptyTags) != -1) {
			return false;
		}

		// text nodes are not empty, if they contain non-whitespace characters
		if (domObject.nodeType === 3) {
			return domObject.data.search(/\S/) == -1;
		}

		// all other nodes are not empty if they contain at least one child which is not empty
		for (var i = 0, childNodes = domObject.childNodes.length; i < childNodes; ++i) {
			if (!this.isEmpty(domObject.childNodes[i])) {
				return false;
			}
		}

		// found no contents, so the element is empty
		return true;
	},

	/**
	 * Set the cursor (collapsed selection) right after the given DOM object
	 * @param domObject DOM object
	 * @method
	 */
	setCursorAfter: function (domObject) {
		var 
			newRange = new GENTICS.Utils.RangeObject(),
			index = this.getIndexInParent(domObject),
			targetNode,
			offset;
		
		// selection cannot be set between to TEXT_NODEs
		// if domOject is a Text node set selection at last position in that node
		if ( domObject.nodeType == 3) {
			targetNode = domObject;
			offset = targetNode.nodeValue.length;

		// if domOject is a Text node set selection at last position in that node
		} else if ( domObject.nextSibling && domObject.nextSibling.nodeType == 3) {
			targetNode = domObject.nextSibling;
			offset = 0;
		} else {
			targetNode = domObject.parentNode;
			offset = this.getIndexInParent(domObject) + 1;
		}
		
		newRange.startContainer = newRange.endContainer = targetNode;
		newRange.startOffset = newRange.endOffset = offset;

		// select the range
		newRange.select();
		
		return newRange;
	},
	
	/**
	 * Select a DOM node
	 * will create a new range which spans the provided dom node and selects it afterwards
	 * @param domObject DOM object
	 * @method
	 */
	selectDomNode: function (domObject) {
		var newRange = new GENTICS.Utils.RangeObject();
		newRange.startContainer = newRange.endContainer = domObject.parentNode;
		newRange.startOffset = this.getIndexInParent(domObject);
		newRange.endOffset = newRange.startOffset + 1;
		newRange.select();
	},

	/**
	 * Set the cursor (collapsed selection) at the start into the given DOM object
	 * @param domObject DOM object
	 * @method
	 */
	setCursorInto: function (domObject) {
		// set a new range into the given dom object
		var newRange = new GENTICS.Utils.RangeObject();
		newRange.startContainer = newRange.endContainer = domObject;
		newRange.startOffset = newRange.endOffset = 0;

		// select the range
		newRange.select();
	},
	

	/**
	 * "An editing host is a node that is either an Element with a contenteditable
	 * attribute set to the true state, or the Element child of a Document whose
	 * designMode is enabled."
	 * @param domObject DOM object
	 * @method
	 */
	isEditingHost: function (node) {
		return node
			&& node.nodeType == 1 //ELEMENT_NODE
			&& (node.contentEditable == "true"
			|| (node.parentNode
			&& node.parentNode.nodeType == 9 //DOCUEMENT_NODE
			&& node.parentNode.designMode == "on"));
	},

	/**
	 * "Something is editable if it is a node which is not an editing host, does
	 * not have a contenteditable attribute set to the false state, and whose
	 * parent is an editing host or editable."
	 * @param domObject DOM object
	 * @method
	 */
	isEditable: function (node) {
		// This is slightly a lie, because we're excluding non-HTML elements with
		// contentEditable attributes.
		return node
			&& !this.isEditingHost(node)
			&& (node.nodeType != 1 || node.contentEditable != "false") // ELEMENT_NODE
			&& (this.isEditingHost(node.parentNode) || this.isEditable(node.parentNode));
	},

	/**
	 * "The editing host of node is null if node is neither editable nor an editing
	 * host; node itself, if node is an editing host; or the nearest ancestor of
	 * node that is an editing host, if node is editable."
	 * @param domObject DOM object
	 * @method
	 */
	getEditingHostOf: function(node) {
		if (this.isEditingHost(node)) {
			return node;
		} else if (this.isEditable(node)) {
			var ancestor = node.parentNode;
			while (!this.isEditingHost(ancestor)) {
				ancestor = ancestor.parentNode;
			}
			return ancestor;
		} else {
			return null;
		}
	},

	/**
	 * 
	 * "Two nodes are in the same editing host if the editing host of the first is
	 * non-null and the same as the editing host of the second."
	 * @param node1 DOM object
	 * @param node2 DOM object
	 * @method
	 */
	inSameEditingHost: function (node1, node2) {
		return this.getEditingHostOf(node1)
			&& this.getEditingHostOf(node1) == this.getEditingHostOf(node2);
	},

	// "A block node is either an Element whose "display" property does not have
	// resolved value "inline" or "inline-block" or "inline-table" or "none", or a
	// Document, or a DocumentFragment."
	isBlockNode: function (node) {
		return node
			&& ((node.nodeType == $_.Node.ELEMENT_NODE && $_( ["inline", "inline-block", "inline-table", "none"] ).indexOf($_.getComputedStyle(node).display) == -1)
			|| node.nodeType == $_.Node.DOCUMENT_NODE
			|| node.nodeType == $_.Node.DOCUMENT_FRAGMENT_NODE);
	},

	/**
	 * Get the first visible child of the given node.
	 * @param node node
	 * @param includeNode when set to true, the node itself may be returned, otherwise only children are allowed
	 * @return first visible child or null if none found
	 */
	getFirstVisibleChild: function (node, includeNode) {
		// no node -> no child
		if (!node) {
			return null;
		}

		// check whether the node itself is visible
		if ((node.nodeType == $_.Node.TEXT_NODE && this.isEmpty(node))
			|| (node.nodeType == $_.Node.ELEMENT_NODE && node.offsetHeight == 0 && jQuery.inArray(node.nodeName.toLowerCase(), this.nonEmptyTags) === -1)) {
			return null;
		}

		// if the node is a text node, or does not have children, or is not editable, it is the first visible child
		if (node.nodeType == $_.Node.TEXT_NODE
				|| (node.nodeType == $_.Node.ELEMENT_NODE && node.childNodes.length == 0)
				|| !jQuery(node).contentEditable()) {
			return includeNode ? node : null;
		}

		// otherwise traverse through the children
		for (var i = 0; i < node.childNodes.length; ++i) {
			var visibleChild = this.getFirstVisibleChild(node.childNodes[i], true);
			if (visibleChild != null) {
				return visibleChild;
			}
		}

		return null;
	},

	/**
	 * Get the last visible child of the given node.
	 * @param node node
	 * @param includeNode when set to true, the node itself may be returned, otherwise only children are allowed
	 * @return last visible child or null if none found
	 */
	getLastVisibleChild: function (node, includeNode) {
		// no node -> no child
		if (!node) {
			return null;
		}

		// check whether the node itself is visible
		if ((node.nodeType == $_.Node.TEXT_NODE && this.isEmpty(node))
			|| (node.nodeType == $_.Node.ELEMENT_NODE && node.offsetHeight == 0 && jQuery.inArray(node.nodeName.toLowerCase(), this.nonEmptyTags) === -1)) {
			return null;
		}

		// if the node is a text node, or does not have children, or is not editable, it is the first visible child
		if (node.nodeType == $_.Node.TEXT_NODE
				|| (node.nodeType == $_.Node.ELEMENT_NODE && node.childNodes.length == 0)
				|| !jQuery(node).contentEditable()) {
			return includeNode ? node : null;
		}

		// otherwise traverse through the children
		for (var i = node.childNodes.length - 1; i >= 0; --i) {
			var visibleChild = this.getLastVisibleChild(node.childNodes[i], true);
			if (visibleChild != null) {
				return visibleChild;
			}
		}

		return null;
	}
});


/**
 * Create the singleton object
 * @hide
 */
GENTICS.Utils.Dom = new Dom();

return GENTICS.Utils.Dom;

});
